door gym

Pull-up/chin-up bar for tool-free doorway installation
Fits easily in 24- to 32-inch doorways (extensions available)
Ideal for pull-ups, push-ups, chin-ups, crunches, and more
Requires trim up to 3.5 inches wide around door
Breaks down and stores in case for easy travel
Optional: Chromeplate or powder coatings 
 

Parameter:

Door gym has three functional :chin up bar,push up bar and sit up spotter.it can be tightened without screws .perfcect keep silm